CN108978673A - A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning - Google Patents

A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning Download PDF

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Publication number
CN108978673A
CN108978673A CN201810813894.4A CN201810813894A CN108978673A CN 108978673 A CN108978673 A CN 108978673A CN 201810813894 A CN201810813894 A CN 201810813894A CN 108978673 A CN108978673 A CN 108978673A
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CN
China
Prior art keywords
construction
foundation pit
roadbed
viaduct
portal frame
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Pending
Application number
CN201810813894.4A
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Chinese (zh)
Inventor
徐志军
刘军
张健
原方
姜学佳
杜乾
刘海林
庞照昆
李志谦
李佳伟
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Henan University of Technology
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Henan University of Technology
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Publication date
Application filed by Henan University of Technology filed Critical Henan University of Technology
Priority to CN201810813894.4A priority Critical patent/CN108978673A/en
Publication of CN108978673A publication Critical patent/CN108978673A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

The invention discloses the foundation pit supporting constructions and construction method of a kind of viaduct pile foundation underpinning in civil engineering in relation to foundation pit supporting project field.Including soil nail wall, crown beam, bracing members, fender post, pipe canopy, portal frame, deep hole grouting region, transverse passage-way.The foundation ditch excavation method combined using open cut with tunneling uses fender post+crown beam+soil nail wall+support organization plan at roadbed tunneling using portal frame+support+pipe canopy and at open cut.The workload of construction operation is not only reduced in the case where safely and reliably guaranteeing the work of top viaduct, and is reduced because of the economic loss directly or indirectly caused by constructing.Foundation pit supporting construction provided by the invention and its construction method efficiently solve the problems, such as that neither influencing traffic when major trunk roads construction of the flyover needs to carry out excavation of foundation pit can be constructed again with safety economy, provide the scheme of an economic and reliable for the scientific and reasonable construction of viaduct.

Description

A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning
Technical field
The present invention relates to the foundation pit supporting constructions and construction method of a kind of viaduct pile foundation underpinning, especially for city trunk First pile foundation of road round road of cross bridge and roadbed joint carries out pattern foundation pit supporting structure when pile foundation underpinning construction.
Background technique
With the rapid development of social economy, living standards of the people are continuously improved, private car and various public transports Increase while blowout is presented in the ownership of society.To meet people's trip and requirements of one's work, various regions government is in multilevel traffic Make an issue of in mode, especially in big city, viaduct and underground railway track traffic are more universal.More due to urban architecture Factor that is intensive and needing to consider traffic, can usually encounter the case where underground railway track traffic lines need to pass through grade separation Bridge Foundation, meet Most common when to this kind of situation is exactly the pile foundation underpinning for carrying out viaduct, to meet the needs that subway transportation is normally built.? The supporting of progress foundation pit is generally required when pile foundation underpinning.
In the construction of viaduct pile foundation underpinning, encountered sometimes to round road of cross bridge and first abutment of roadbed connecting place Pile foundation underpined, need to carry out earth excavation to the abutment foundation that underpins, to meet construction needs.When carrying out earth excavation To guarantee construction safety, it is necessary for carrying out pattern foundation pit supporting structure.Pattern foundation pit supporting structure is to guarantee Underground Construction and foundation pit week The safety of surrounding environment, supporting and retaining system, reinforcing and the safeguard measure that foundation pit side-wall and surrounding enviroment are used.
Common pattern foundation pit supporting structure form mainly has: campshed supporting, stake support, piled anchor, campshed cantilever;Diaphram wall supporting, Ground-connecting-wall+support;Cement retaining wall;Soil nail wall (combined bolting and shotcrete);It is inverse to make arch wall;Undisturbed soil slope;Stake, wall add support system; Simple horizontal support;Armored concrete campshed;The reasonable combination etc. of above two or two or more modes.In road and bridge Pattern foundation pit supporting structure is met in work progress and carries out construction operation frequently with the mode of open cut often, and this operation mode is to a certain extent Interruption of communication is caused, certain economic loss is brought;Or constructed by the way of tunneling, but this form of construction work operation is difficult Degree is big, and operating expenses is high.
Summary of the invention
When first abutment of round road of cross bridge and roadbed connecting place carries out pile foundation underpinning, pattern foundation pit supporting structure is big tired there is two Difficulty, first, open cut suspends traffic;Second, tunneling increases difficulty of construction and expense.In order to overcome above two big difficult, the present invention Provide it is a kind of at roadbed tunneling using portal frame+support+pipe canopy foundation pit structure scheme, fender post is used at open cut The construction method for the excavation of foundation pit that+crown beam+soil nail wall+support foundation pit structure scheme and open cut tunneling combine.
The technical solution adopted by the present invention to solve the technical problems is: a kind of pattern foundation pit supporting structure knot of viaduct pile foundation underpinning Structure and construction method, including fender post, crown beam, portal frame, Guan Peng, support rod and soil nail wall.It is carried out at foundation pit walls axis The construction that level-one is excavated and carries out crown beam and fender post is done in the construction of fender post after construction, interconnection lower part under roadbed, The deep hole grouting and steel tube shed erection construction of side wall, when earth excavation, first excavate both ends open excavation section foundation pit, carry out soil nail wall later Construction, type steel support is installed in open cut part, then performs portal frame from the open cut end group hole of side and carries out steel tube shed frame If the tunneling section since portal frame under roadbed is constructed, every excavation a certain distance needs to install portal frame, while lateral Open cut excavation is carried out, and sets up support, progress bridge pier underpins after completion is excavated in tunneling, and progress foundation pit returns after underpining completion It fills out.
The foundation pit supporting construction and construction method of a kind of above-mentioned viaduct pile foundation underpinning, fender post are set by abutment both ends Cast-in-situ bored pile.Soil nail wall includes the soil nailing and wall table reinforced mesh using the reinforcement fabrication of suitable grade.Support is satisfaction It is required that fashioned iron.Portal frame is made of fashioned iron and steel plate, and meets actual needs.Pipe canopy is carried out using the steel pipe of suitable diameter It is laid with, is laid with range and is portal frame lateral length and extends 0.5m, to meet safe construction needs.
The invention has the advantages that the present invention a kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning, Efficiently solving the pattern foundation pit supporting structure when first abutment of round road of cross bridge and roadbed connecting place carries out pile foundation underpinning may produce Raw interruption major trunk roads traffic or the higher disadvantage of construction cost.The foundation ditch excavation method combined using open cut with tunneling, It is used at roadbed tunneling and uses fender post+crown beam+soil nail wall+support structure side at portal frame+support+pipe canopy and open cut Case reduces the workload of construction operation while safely and reliably guaranteeing the work of top viaduct and reduces because of construction Caused economic loss.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is diagrammatic cross-section of the present invention;
Fig. 2 is floor map of the present invention;
1. armored concrete mesh sheet in Fig. 1,2. soil nailings, 3. crown beams, 4. bracing members, 5. fender posts, 6. pipe canopies, 7. portal frames, 8. deep hole grouting region, 9. roadbeds, 10. abutments, 11. transform beams, 12. transverse passage-ways;
1. armored concrete mesh sheet in Fig. 2,3. crown beams, 4. bracing members, 5. fender posts, 6. pipe canopies, 10. abutments, 11. transform beams, 12. transverse passage-way, 13. level-one slopes are excavated.
Specific embodiment
[embodiment]
A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning, referring to Figures 1 and 2, including armored concrete net Piece (1), soil nailing (2), crown beam (3), bracing members (4), fender post (5), pipe canopy (6), portal frame (7), deep hole grouting region (8), roadbed (9), abutment (10), transform beams (11), transverse passage-way (12), level-one slope excavate (13).The armored concrete net Piece (1) and soil nailing (2) are needed by reinforcing bar grade and dosage is calculated;The bracing members (4) and portal frame (7) be both needed to through It is formed after crossing calculating using section steel manufacture;Fender post (5) is the cast-in-situ bored pile for being calculated and being designed by Practical Project;Crown beam (3) reinforced concrete continuous beam being arranged at the top of foundation pit periphery fender post (5), effect is that all pile foundations are connected to together Prevent foundation pit top edge from generating collapsing;Pipe canopy (6) is laid with using the steel pipe of suitable diameter, and laying range is portal frame Lateral length simultaneously extends 0.5m, to meet safe construction needs;It is portal frame that deep hole grouting region (8), which needs the range of slip casting, Range and need 1m and right side 1m range on the downside of portal frame to carry out grouting treatment;Roadbed (9) be viaduct pontic and The roadbed of roadbed junction;Abutment (10) is first abutment at roadbed and round road of cross bridge first friendship;Transform beams (11) be into Row foundation underpinning done transform beams when constructing.
Referring to Figures 1 and 2, smooth location is carried out first, performs newly-built cushion cap bridge pier;Abutment both ends fender post (5) is performed, And level-one slope excavation (13) are carried out to viaduct lower part;Level-one excavates slope (13) in cheating, and performs abutment (10) side and goes along with sb. to guard him Stake (5) and stake top crown beam (3);Deep hole grouting is carried out to roadbed (9) lower part transverse passage-way (12) and side wall;Excavate two end group of channel Hole, and supporting is carried out in time, it sets up portal frame (7), finally carries out pipe canopy (6) erection;Into hole since portal frame (7), 0.5m is excavated every time, and carries out bracing members (4) supporting in time, starts simultaneously at the lateral open-cut of transverse passage-way (12) and carries out fashioned iron It supports (4);Transform beams (11) are performed, and completes bridge pier and underpins;Carry out the foundation pit backfill of transverse passage-way (12) and open cut range, bridge pier Underpin completion.

Claims (3)

1. a kind of foundation pit supporting construction of viaduct pile foundation underpinning, including armored concrete mesh sheet (1), soil nailing (2), crown beam (3), Bracing members (4), fender post (5), pipe canopy (6), portal frame (7), deep hole grouting region (8), transverse passage-way (12).
2. a kind of foundation pit supporting construction of viaduct pile foundation underpinning according to claim 1, which is characterized in that avoid standing Interruption of communication is caused when handing over bridge pile foundation underpinning, open cut mode is used at no roadbed, building enclosure includes armored concrete mesh sheet (1), soil nailing (2), crown beam (3), bracing members (4), fender post (5);Tunneling mode is used at roadbed to protect roadbed and top Structure, building enclosure include bracing members (4), pipe canopy (6), portal frame (7), deep hole grouting region (8), transverse passage-way (12).
3. a kind of construction method of the pattern foundation pit supporting structure of viaduct pile foundation underpinning, which is characterized in that combined using open cut and tunneling Arrangement and method for construction, use cut and cover tunneling in the side far from roadbed, and perform by armored concrete mesh sheet (1) and soil nailing (2) The soil nail wall of composition, crown beam (3) and fender post (5);In the side close to roadbed using shallow mining method first to roadbed (9) lower part Transverse passage-way (12) and side wall carry out deep hole grouting;Channel both ends foundation pit is excavated, and carries out supporting in time, is set up portal frame (7), Steel tube shed pipe canopy (6) are finally carried out to set up;Into hole since portal frame (7), 0.5m is excavated every time, and carries out bracing members in time (4) supporting starts simultaneously at the lateral open-cut of transverse passage-way (12) and carries out type steel support (4).
CN201810813894.4A 2018-07-23 2018-07-23 A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning Pending CN108978673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810813894.4A CN108978673A (en) 2018-07-23 2018-07-23 A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810813894.4A CN108978673A (en) 2018-07-23 2018-07-23 A kind of foundation pit supporting construction and construction method of viaduct pile foundation underpinning

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110644501A (en) * 2019-09-27 2020-01-03 中冶成都勘察研究总院有限公司 Foundation pit supporting and underpinning bearing platform combined construction method with zero distance from original building

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110644501A (en) * 2019-09-27 2020-01-03 中冶成都勘察研究总院有限公司 Foundation pit supporting and underpinning bearing platform combined construction method with zero distance from original building

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